Went to APK mirror and grabbed the SpeedTest apk (arm), and ran it with the mouse hooked up to my usb to ethernet adapter: https://www.amazon.com/gp/product/B00LLUEJXW/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
came in with this, so it seems to be running well:
Haha this got totally derailed.
This only tests your internet speed though, not the maximum transfer rate over your local network.
I've always used Wifi Speed Test:
https://play.google.com/store/apps/details?id=com.pzolee.android.localwifispeedtester&hl=en
You sideload it to your device and then from your computer you go here and download and run wifi_speed_test_server.exe.
Open Wifi Speed Test from your device and configure it to connect to the server running on your PC(ip and port the server is running on).
Once that is done you can run upload/download network speed tests to see what your transfer rates are like with the adapter you're using.
By default it tests wifi speed, but you can go into the settings and select ethernet.
It's a very useful tool. It showed me just how terrible the xiaomi usb 2.0 ethernet adapter I had originally tried to use was. The transfer rates were atrocious. I bought another brand and the test results were so much higher. Which was also apparent when I could now stream 15-20GB high bitrate 1080p mkvs in Kodi over the network without any more buffering.
Wouldn't it be easier just to use a mouse with a USB connection?
Alternatively, you could run Chrome and use fast.com